Is there a maximum size to the aquarium I put a betta in? I have a 20 gallon with a male betta, guppies, rasboras, and a pleco. I would like to upgrade them to a larger tank in a few months. How big could I go? Could I do like 100 gallons or would all that space freak him out? His name is Jeremy, btw :)

The biggest "longs" I have seen are only like 30 or 40 gallons. I think if I went any bigger I would have to get it custom made. I might just settle for 40 gallons. I don't want it to be too deep. The aqueon 40 gallons is 48 x 13 x 16 inches, which is as tall as my current 20 gallon. So I think the 40 gallon long is just like two 20 gallon highs put next to each other. That seems pretty big, considering I am only getting betta friendly species (aka smaller than him lol).

Hmm, thinking about it I might just get the 33 gallon long and let my guppies fill the space up. It is 48 x 13 x 12, so I think a betta would like how shallow it is. 12 inches is also the height of the 10 gallon, so picture three ten gallons placed next to each other plus a little extra. Do you think the guppies and rasboras will mind that it is shallower?